<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <!-- 提交表单时，跳转的页面 URL -->
  <form action="./action.html">
    <input type="text" name="username">
    <input type="submit">
  </form>
</body>

</html>